When merging windows with Groupy, the screen keeps flickering as soon as I open the settings interface of the Brother printer.

Hello,
Sorry to hear you are having issues. First, Please try, uninstall Groupy, reboot immediately (important), download latest version available in your account product download page: https://store.stardock.com/myaccount/products. Install it, reboot immediately again. Retest it and report back.

If the issue still appear, we need more details.

1. Your Windows 11 full version and OS Build number. Use Winver.exe.
2. Groupy full version numbers.
3. Please elaborate more on your issue and what "Brother Printer" got to do with your issue.

Thank you,
Basj,
Stardock Community  Assistant.